Deadlocking latchbolt for cylindrical lock



Dec. 23, 1958 P. P. KUBIK DEADLOCKING LATCHBOLT FOR CYLINDRICAL LOCK 3 Sheets-Sheet 1 Filed Aug. 20, 1956 INVENTOR.

A TTOR'NEY Dec. 23, 1958 P. P. KUBIK DEADLOCKING LATCHBOLT FOR CYLINDRICAL- LOCK Filed Aug. 20, 1956 5 Sheets-Sheet 2 44 4e 58 4a 39 4o INVENTOR.

& My WM A MWM 40? w M 3 4 Dec. 23, 1958 P. P. KUBIK DEADLOCKING LATCHBOLT FOR CYLINDRICAL LOCK Filed Aug. 20, 1956 3 Sheets-Sheet 3 INVENTOR.

ATTORNEY DEADLOCKBNG LATCHQGIIT FOR CYLINDREEAL LOCK Paul P. Kuhik, Philadelphia, Pa, assignor to The Yale Towns Manufacturing Company, Stamford, (Jenna, a corporation of Connecticut Application August 20, 1956, Serial No. 61943599 9 Claims. (Cl. 292-163) This invention relates to deadlocking latchbolts for cylindrical locks.

As will be understood by those persons skilled in the art, latchbolts cf the particular class move in a latch tube between projected and retracted positions, and are automatically deadlocked when the door on which the lock is mounted moves to closed position. The deadlocking is effected by a dog on the latch tube, with a trigger belt utilized as a part of the control for the dog. That trigger bolt when in a projected position holds the dog out of dogging relation to the latchbolt so that the latchbolt can be retracted, but when the trigger bolt is depressed by a strike, it effects deadlocking movement of the dog. Naturally, the latchbolt is equipped also with means that can move the dog to release positicn even though the trigger bolt is depresced by the strike, so that the latchbolt can be retracted through knob action when the door is in cosed position. Thus, the latchbolt requires for its functioning several part that move within the latch tube. While mcunted in the relatively small space that is available in the latch tube, it is very important that those parts operate in an effective and dependable manner.

The prior art contains many examples of latchbolts of the particular class. In those earlier latchbolts, it is customary to utilize one tail member through which the latchbolt is retracted, together with a further tail member that is arranged to have a certain movement relatively to the first member. That relative movement between the tail members is utilized to move the deadlocking dog out of dogging position. In other words, the earlier latchbolts of the particular class are equipped with a tail through which knob action will retract the bolt, together with a further tail through which the knob action first r 2,865,665 Patented Dec. 23, 1958 pressed by a strike, with the dog again riding over the latchbolt.

As a further feature of my invention, 1 utilize means through which I multiply the movement of the latchbolt, but that enables me to reduce the bearing pressures on the bolt. More particularly, I utilize between the single tail member and the latchbolt a multiplying link. That link is in bearing relation to the latchbolt through a slider that applies the retracting pressure over a very considerable area on the latchbolt, thus enabling me to reduce wear between the link and bolt.

As a still further feature, I so form my novel bolt deadlocking and retracting mechanism that it may very readily be assembled through the positioning of the mechanism in the latch tube. Thus, I need merely place the parts of my mechanism in their assembled relation to one another, and then insert those parts into the latch tube. The parts will then be held in the tube simply through the assembly'of a front plate to the tube.

I have thus outlined. rather broadly the more important features of my invention in order that the detailed description thereof that fcllows may be better understood, and in order that my contribution to the art may be better appreciated. There are, of course, additional features of my invention that will be described hereinafter and which will form the subject of the claims appended hereto.

moves the dog out of dogging position. In effect, therefore,

those latchbolt mechanisms have double latchbolt tails. Through the extremely novel construction that I have now conceived, I achieve an operation like that'of the earlier deadlocking latchbolts, but I do this through extremely novel means that are relatively simple and that require for their efficient operation merely a single tail member for the latchbolt. In addition, my construction enables me very effectively to multiply the bolt movement rela- "vely to the tail member.

As a very important feature of my invention, Ifutilize a deadlocking dog that moves to three diiierent positions. Thus, the deadlocking dog when in a first position will dog the latchbolt in projected position. The single tail member is then in camming relation to the dog, so that the tail when retracting the latchbolt will earn the dog to a second or intermediate position. The latchbolt is then in camming relation to the dog, so that the latchbolt by its retracting movement will cam the dog to a third position. The dog when in that'position will ride over the latchbolt so that the bolt can move to full retracted position. Further, I equip the trigger bolt with a portion that earns the dog to its second position when the trigger belt projected, whereby the latchbolt can then be de- Those skilled in the art will appreciate that the conception on which my disclosure is based may readily be utilized as a basis for the designing of other structures for carrying out the several purposes of my invention. It is important, therefore, that the claims be regarded as including such equivalent constructions as do not depart from the spirit and scope of my inventicrl, in order to prevent the appropriation of my invention by those skilled in the art.

Referring nowto the drawings:

' Fig. l is a longitudinal section showing parts of my novel deadlocking mechanism in the position they occupy when the door is open.

Fig. 2 is a section taken at right angles to Fig. 1.

Fig. 3 is like Fig. l, but with the parts in the position they occupy when the trigger bolt is held depressed by a strike.

Fig. 4 shows the trigger bolt depressed, with the tail member moving vpreparatory to retracting, the latchbolt.

Figs. 5 and 6 are cross sections on the lines 5-5 and 66 of Fig. 1.

Figs. 7 and 8 are perspective views showing the trigger bc-lt.

To facilitate a description of my invention, I shall first call attention to the fact that l utilize in my extremely novel construction a latch tube lit, a latchbolt 11 and trigger bolt 12 that slide in the latch tube 10 between projected and retracted positions, and a tail member 13 for retracting the latchbolt. This general arrangement is quite similar to that utilized in prior latchbclts of the particular class, and those skilled in the art will understand that the latch tube It) is adapted to be assembled to a spindle housing 14, Fig. l, with a retractor 15 in that housing in retracting relation to the tail member 13.

In the form of my construction that I prefer, I utilize an end piece 16, Figs. 1 and 2, that is assembled through the opposed sides of the end piece 16 with spring guides 18,

best seen in Fig. 2, and on those guides I assemble coil springs 19 that press the latchbolt 11 toward projected position. One of those springs 19 actually presses the trigger bolt 12., but that spring also can press the latchbolt 11 since'the trigger bolthas a part 2%, Figs. 5 and 8, adapted to lie against the rear end of the latchbolt. The rear portion of the tail member 13 slides in an opening in the end piece 16, with the front portion of the tail member extending toward the latchbolt 11, as may be clearly seen in Figs. 1 and 2; I shall describe in detail the novel means through which the tail member 13 will retract the latchbolt 11, but my invention willbe better appreciated if I describe at this point the novel deadlocking construction that I have conceived. I

As is well shown in Figs. 1 and 2, I utilize a deadlocking lever 21 that is inserted with the end piece 16 into position in the latch tube 10, with the inner surface of the tube holding the rear end of the lever 21 assembled in pivoted relation to end piece 16. The end piece 16 has a pair of guide lugs 22, Fig. 2, that lie at opposed sides of the dea-dlocking lever 21 to hold that lever in aligned relation to tail member 13. I further utilize a spring 23 that is formed with a medial portion engaged over the upper surface of deadlocking lever 21 to press that lever toward tail member 13. The spring 23 further has opposed sides 24 that are formed as loops engaged about lugs 25 on end piece 16 whereby to hold the spring assembled. The actual construction of the lugs 25 is not important to an understanding of my invention, but I do prefer to form those lugs as parts of a thin plate 26 that is integrally assembled to end piece 16. The loops 24- of spring 23 have ends 27 that extend forwardly to press relatively to the inner surface of the latch tube 10.

On the front end of deadlocking lever 21 I form a dogging surface 28 and a cam surface 29 well shown in Fig. 1, with a further cam surface 30 facing in a rearward direction. Also, I form the trigger bolt 12 with an integral portion 31 that moves along tail member 13 during the movement of that bolt. With the door open and the trigger bolt projected, as is the case in Fig. 1, the portion 31 is positioned under the end of deadlocking lever 21 to hold the lever in what I term its intermediate position, Fig. 1. It will next be observed that latchbolt 11 has a part 32 on which is a surface 32a for coacting with deadlocking lever 21. As shown in Fig. l, the part 32 is stake-d in an opening in latchbolt 11 and overlies the front end of the tail member 13, but it is important to know principally that art 32 moves with latchbolt 11.

With 'deadlocking lever 21 in intermediate position, as in Fig l. the cam surface 29 on the lever is in opposed relation to surface 32a on the latchbolt part 32. Thus, it will be seen that the latchbolt, when depressed by a strike during closing of the door, will cam the dog or lever 21 to a third or release position, with the lever then riding over the latchbolt part 32. This naturally will enable the latchbolt 11 to move to its fully retracted position.

If we now assume that the door on which the lock is mounted 'moves to fully closed position, the latchbolt 11 will be projected into engagement with the strike 33, as is shown in Fig. 3, with the trigger bolt 12 held depressed by the strike. When the trigger bolt is so depressed, its portion 31 will move away from the deadlocking lever 21 so that spring 23 will move the lever to its dogging position, with the dogging surface 28 opposed to the surface 32a on latchbolt part 32, all as shown in Fig. 3. If an attem t is now made to depress the latchbolt 11, the lever 21 will prevent movement of the latchbolt to retracted position.

Let us now see what happens if, with the door closed and the trigger bolt 12 depressed by the strike, as in Fig. 3, the latchbolt 11 is retracted through the tail member 13. I form on tail member 13 a shoulder 34, and, when retracting movement is applied to the tail 13, shoulder 34 will move against the cam surface 29 on lever 21, thus camming the lever to its intermediate position as shown in Fig. 4. In that'position, the lever 21 is no longer in dogging relation to the latchbolt part 32 but presents its camsurface 29 to that part 32. This naturally enables the latchbolt 11 to cam the lever 21 to full release position, so that the bolt can then be fully retracted. Thus, the tail member 13 always can retract the latchbolt 11, whether or not the trigger bolt 12 is depressed by the strike.

It is important to realize that I achieve the deadlocking and release action that I have described while utilizing merely a single tail member for retracting the bolt. I am able to do this through the utilization of a novel deadlocking dog or lever that moves to three positions, with the lever adapted to be cammed from dogging position to intermediate and full release positions.

I shall now describe, while referring to Figs. 1, 2, 5, and 6, the novel means through which the tail member 13 acts to multiply the movement of the latchbolt 11. On o posed sides of tail member 13 I assemble a pair of links 35 through a pivot 36, best seen in Fig. 1, that is engaged in a slot 37 in the tail member. As shown in Figs. 2 and 5. the links 35, together with the front end of tail member 13, are arranged to move in the space between side portions 38 that I form on latchbolt 11. I equip the links 35 at their lower ends with a pivot 39, Figs. 1 and 5, on which the. links rotaterelatively to the latch tube 10. For mounting the pivot 39, I prefer to utilize a pivot plate 40 having a portion 41 that interlocks with an arm 42 on the end piece 16. As will be understood from Fig. l, the inner surface of latch tube 10 holds pivot plate 40 assembled to arm 42, with an end portion 43 then supporting the pivot 39.

On the upper ends of links 35 I utilize particularly a a pair of sliders 44, Figs. .1, 2, and 6. These sliders 44 are pivoted to opposed sides of links 35 through pins 45, with the sliders in position to coact with bearing surfaces 46 that 1 form on the side portions 38 of the latchbolt. It will naturally be understood that the tail member 13 will act through the links 35 and sliders 44 to retract latchbolt 11, with the'bolt movement multiplied relatively to that of the tail 13. It is extremely important to realize, however, that I am able through the sliders 44 to apply the retracting pressure over a rather considerable area on the latchbolt 11. Thus, the sliders 44 have a relatively long contact with the bearing surfaces 46, and a very little wear will take place between the sliders and bearing surfaces.

In assembling my novel latchbolt mechanism, the sliders 44 and links 35 will be preassembled to the tail member 13 through the pivots 36 and 45, with the tail member then assembled to the end piece 16. It will then be a simple matter to apply the sliders 44 to the latchbolt 11 through a transverse movement, and also to place the trigger bolt 12, deadlocking lever 21, and pivot plate 40 in position. Then, after inserting the mechanism into the latch tube 10, the inner surface of the tube will hold the mechanism assembled. To hold the mechanism in the tube, I utilize simply a rather usual front plate 47 that is riveted to flanges 48 on latch tube 10, that plate engaging shoulders 49 onthe bolt, as shown in Fig. l. 7

Through the exceedingly novel construction that I have described, I am able to achieve full deadlocking control of a latchbolt through very simple means. I utilize in that novel construction merely a single tail member and a simple moving dog, yet I contribute very effective and dependable bolt control. In addition, I achieve a multiplying bolt action, yet I eliminate excessive wear on the bolt or retracting links. I believe, therefore, that those skilled in the art will appreciate the very considerable contributron that I have made by my invention. I

I-now claim:

1. In a lock of the class described, a latch tube, a latchbolt moving in the latch tube between projected and retracted positions, a single tail member through which said bolt is moved to retracted position, a lever mounted for movement on the latch tube, a spring pressing said lever to a first position relatively to said single tail member, said lever formed with a dogging surface that is in opposed relation to a part on the latchbolt when the lever is in its said first position whereby to dog the latchbolt in projected position, said lever further formed with a cam surface in coacting relation to a shoulder on the tail member when the lever is in first position, said tail member when retracting the bolt with the lever in first position acting through said shoulder cam surface to move the lever to a second position, said lever in its second position lying with its dogging surface out of opposed relation to the latch bolt part and with its cam surface in opposed relation to said part whereby said cam surface will ride over the part as the latchbolt moves to retracted position, a trigger bolt moving on the latch tube between projected and retracted positions, a portion on said trigger bolt holding the lever in second position when the trigger bolt is in projected position so that the latchbolt can then be depressed by a strike, and said lever formed with a further cam surface whereby the said trigger bolt portion will move the lever to second position in the event the lever is not in that position when the trigger bolt moves to projected position.

2. in a lock of the class described, a latch tube, an end piece inserted through the front end of the tube into assembled position on the rear end of the tube, a tail member mounted to slide in an opening in said end piece, a latchbolt and a trigger bolt sliding between projected and retracted position on the tube, a link assembled to the tail member for pivotal movement and equipped at one end with a pivot pin, a pivot plate inserted with the end piece into the latch tube and held assembled relatively to the end piece by the inner surface of the tube, a portion on said pivot plate acting when the plate is assembled to hold the pivot pin whereby to mount the link to pivot at a fixed point on the tube, a slider pivoted to the end of said link that is opposed to said pivot pin, a bearing portion on the latchbolt against which the slider bears whereby the tail member by acting through the link will retract the bolt with a multiplying movement, and said slider engaging the bearing portion of the bolt over a relatively large area whereby to reduce the retracting pressure applied to the bearing portion of the latchbolt.

3. In a lock of the class described, a latch tube, a latchbolt and a trigger bolt mounted in said latch tube for movement between projected and retracted positions, a bearing portion formed on the latchbolt to extend in a direction transverse to the latchbolt axis, a slider coacting with said bearing portion, link means pivoted to said slider, means whereby said link means are in pivoted relation to the latch tube, a tail mounted for movement on the tube, means through which the tail when moving in one direction actuates said link means whereby to slide the slider on the bearing portion of the bolt to retract the bolt with the link means multiplying the movement of the bolt relatively to the tail, said slider engaging the bearing portion of the bolt over a relatively large area whereby to reduce the bearing pressures on said portion, a deadlocking lever spring pressed toward a dogging position relatively to said latchbolt and movable to a release position, a cam surface on the deadlocking lever, said tail formed with a surface that is in opposed relation to the cam surface on the deadlocking lever when the lever is in dogging position whereby the tail when moving to retract the bolt will move the lever from dogging position to a second position, a part on the latchbolt in opposed relation to the cam surface on the lever when the lever is in said second position so that the latchbolt when retracted will cam the lever to release position, and a portion on said trigger bolt acting when the trigger bolt is in projected position to hold the lever in its second position.

4. In a lock of the class described, a latch tube, a latchbolt moving in said latch tube between projected and retracted positions, a tail adapted to be moved longitudinally in the latch tube by a retractor and through which the retractor moves the latchbolt to retracted position, a deadlocking lever spring pressed toward a posi tion dogging the latchbolt and movable against the spring pressure to release position, a part on the latchbolt in camming relation to the deadlocking lever when said lever is in an intermediate position relatively to its 6 dogging and release positions, a trigger bolt moving in the latch tube between projected and retracted positions, a portion on said trigger bolt acting when the trigger bolt is in projected position to hold the deadlocking lever in said intermediate position, whereby said part on the latchbolt by its camming relation to the lever will move the lever to its release position when said latchbolt is retracted, a portionon the said tail in camming relation to the deadlocking lever when the lever is in dogging position, and said portion on the tail effective when the trigger bolt is in retracted position to move the lever to said intermediate position as the retractor moves the tail to retract the latchbolt.

5.. In a lock of the class described, a latch tube, a latchbolt moving in said latch tube between projected and retracted positions, a tail adapted to be moved longitudinallyin the latch tube by a retractor and through which the retractor moves the latchbolt to retracted position, a deadlocking lever spring pressed toward a dogging position and movable against the spring pressure to a release position, a surface on said lever in opposed relation to a part on the latchbolt when the lever is in clogging position whereby to dog said latchbolt, an inclined cam surface on said deadlocking lever, a trigger bolt moving in the latch tube between projected and retracted positions, and a portion on said trigger bolt acting when the trigger bolt is in projected position to hold the deadlocking lever with its cam surface in opposed relation to a part on the latchbolt, whereby a retracting movement of said latchbolt then will be effective through said cam surface to move said deadlocking lever to its release position.

6. in a lock of the class described, a latch tube, a latchbolt moving in said latch tube between projected and retracted positions, a deadlocking lever, a spring pressing said lever to a position dogging the latchbolt in projected position and yielding to enable the lever to move away from dogging position, a tail adapted to be moved longitudinally in the latch tube by a retractor and through which the retractor moves the latchbolt to retracted position, a portion on said tail in camming relation to said deadlocking lever when said lever is in dogging position, said tail portion camming said deadlocking lever to a second position when the tail moves longitudinally to retract the latchbolt, a portion on the latchbolt moving into camming relation to the deadlocking lever when said lever is in said second position as the latchbolt moves toward retracted position, and said portion on the latchbolt then eifective to cam said lever from its second position to a release position relatively to the latchbolt so that the retractor by acting solely through said tail will impart full retracting movement to said bolt. v

7. In a lock of the class described, a latch tube, a latchbolt mounted in said latch tube for movement between projected and retracted positions, a flat bearing surface formed on the latchbolt to extend in a direction transverse to the latchbolt axis, a slider having a fiat surface coacting with said bearing surface of the latchbolt, a tail member mounted for longitudinal movement relatively to said latch tube, link means supporting said slider and through which said tail member moves said slider whereby to retract the latchbolt with the link means multiplying the movement of the bolt relatively to the tail member, said slider when retracting the bolt sliding its flat surface longitudinally on the flat bearing surface of the bolt, a pivot on which said slider rotates relatively to said link means, and said flat slidersurface effective through rotation of the slider on its pivot to maintain contact with a relatively large area of the flat bearing surface of the latchbolt in the different positions to which the slider moves while retracting the latchbolt.

8. In a lock of the class described, a latch tube, an end piece inserted through the front end of the tube intO assembled position on the rear end of the tube, a tail member mounted to slide in an opening in said end piece, a latchbolt and a trigger bolt sliding in the latch tube between projected and retracted positions, a link through which said tail member acts to retract the latchbolt and trigger bolt, pivot means on which said link rotates, including a part formed to interlock relatively to said end piece and inserted with said end piece into the latch tube, the inner surface of the latch tube holding said part in its interlocking relation to the end piece whereby to hold the pivot means and link in assembled position, a deadlocking lever formed to interlock relatively to said end piece and inserted with the end piece into the latch tube, said lever and end piece having coacting pivot surfaces, the inner surface of the tube holding said deadlocking lever in its interlocked relation whereby to hold said lever assembled to the end piece for pivotal movement thereon, and said deadlocking lever formed with surfaces coacting with said tail member, said trigger bolt, and said latchbolt.

9. Ina lock of the class described, a latch tube, an end piece inserted through the front end of the tube into assembled position-on the rear end of the tube, a tail member mounted to slide in an opening in said end piece, a latchbolt sliding in the latch tube between projected and retracted positions, a link through which said tail member acts to retract the latchbolt, pivot means on which said link rotates relatively to the latch tube, including a part formed to interlock relatively to said end piece and inserted with said end piece into the latch tube, and the inner surface of the latch tube juxtaposed to said part to hold it in its interlocking relation to the end piece when inserted in the tube whereby to hold the pivot means and link in assembled position.

References Cited in the file of this patent UNITED STATES PATENTS Fransworth June 28, 1955 Golden et a1. Oct. 23, 1956 

